dallas, one degree off the record. everybody? >> all right, sam, thanks so much. >>> coming up next on "gma," downtown new york in total darkness. josh plunging into the spooky streets with only night vision to guide him. how people are surviving there right now. >>> and it's one of the biggest races in the world. now, a huge controversy heating up over whether the new york city marathon should take place this sunday. >>> and shark punch. we'll hear from the woman who saved her own life by karate chopping a 12-foot tiger shark. chopping a 12-foot tiger shark. while protecting our environment. across america, these technologies protect air - by monitoring air quality and reducing emissions... ...protect water - through conservation and self-contained recycling systems... ... and protect land - by reducing our footprint and respecting wildlife. america's natural gas... domestic, abundant, clean energy to power our lives... that's smarter power today. mmm. i don't know, i think i might bail. yeah, it's pretty dead. [ male announcer